Improve breadcrumb navigation for missing n-key on item level
Feature Requests
Description
The TextAPI sets the n key on item level as optional: https://subugoe.pages.gwdg.de/emo/text-api/page/specs/#item-object
This key seems to be used for the breadcrumb navigation in the header for informing users where there are at the moment:
If n isn't present, we currently display a "No itemlabel :(" notification. Since n is optional we should discuss if such a prominent feature as the breadcrumb nav should depend on it.
User Stories
As a project that doesn't provide a n key for my items I need a breadcrumb navigation that doesn't contain error messages in order to avoid the impression that my data is faulty.